7-3 in placements, placed iron 1.

King Adam - Summoner Stats - League of Legends
King Adam / Iron 1 0LP / 6W 3L Win Ratio 67% / Lv. 31
It is saying that my mmr is low, on a account that I have never done ranked on before. Wanted to test the waters with the new update. Apparently I'm placed in iron 1, while playing with plate/high gold players? Why is it saying , "Your MMR is lower than the average expected MMR for players in your division. Your MMR will continue to tank unless you improve your play!" Educate me on why I'm in iron 1 after finishing 10 games while playing with players higher then gold elo.
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